Rotary sintering-furnace.



H. C. WOLLE. ROTARY SINTBRING FURNACE. APPQIUATION FILED mute, i911A 159053 3969 Il 'ITV/55511152 'UNITED s'rii'rns vieiiiajaNrf oiirica.,

HARTLEY WOLLE, WESTMONT 'BROUGH, PENNSYLVANIA.

ROTARY sINfiERiNGQrUitNACE,

'citizen ofthe United States, residing in the 'borough of Westmont, l'in the county ot Cambria and State of Pennsylvania, have *invented certain newanduseful 'Improve- 'ments iiifRota'ry SinteringfFurnaces; and I do herebydeclarethe following to be -a f ull, clear, and exact description of the invention, such as willenable others skilled in the art 'to whichit appertains to make and use the My invention relates to Iimproif'enlents in vsintei'ing furnaces for metallurgie or other luse with special reference to lmeans for preventing theaccumulation of rings or other massesvof sintered, aggloinerat'ed or elinkered material therein. i

In order to simplifythe description and the drawings,-Il will describe and illustrate myy invention in connection with a rotary,A

cylindrical furnace of considerable length, the axis of which is sliglit-ly inclined from the horizontal, the body of the furnacebeing adapted to revolve while' the vfire or heat from any suitable source is admitted into the 1 lower interior end of the same and the prod ucts of combustion are dischargedI at the upper end; meanwhile the materials to be sintered are charged into, the upper end, and

pass through the furnace by the revolution "and inclination thereof, and are discharged My furnace. practically adapted for use in sintering or agglomerating' blastl furnace Hue dust, tine ores, or other-materials into I Llumps or nodules, by subjectingr the same to increasing tem 'erature as they pass through the furnace, t iis agglomerating being accomplished bythe fritti-iig or semi-fusion of the main'constituents of the materials or of Athe impurities contained therein, thereby forming the pulvci'ulentmaterials into nodiiles or particles of appreciable size by the combined action of heat and agitation in connection with the other particles of siniilar materials.

-heeii discovered, that under certain coiidi' or semi-fused material in certain localities,

`the passage of, the materials and the- -ases through the furnace. `This necessiat the cooler.

specification-'0i Lette'rrateiit, Patented Oct. I, wll'jlf. Application sieri' :une 6,1911. serial No, esi-,Sfar A 'tat-es' shutting down' of the 'furnace' forthe I 'i removal of the l-accuniulatic'in .which causes,-

' expense and delay.

" My vinvention consists :generally in pro viding a 'cool strip of material inserted longitudinall of the'lining'of the furnace, the

surface `o said cool strip beingcontinuoiis with the surface of the lining'or projecting above the same, as maybe desired. This cool strip which I call the cooler, willpi'e vent, by reason-of its coolness, lthe accumulation of sintered material thereon.A

' The accumulation of sinter'ed material will therefore not form in the shape of a'continuous ring, but will vleave a gap 'or breali keystone thereof so that, as the furnace re! v'olvesfthe accumulationwill fall down-to the bottom thereof and be carried out 'with the other sintered material in due course of the operation.

I consider that one'cooler, inserted longitudinally of the furnace throughout that portion of its length -where the conditions and temperature are such as to cause the accumulation previously referred to, will `be The accumulation -will then I somewhat resemble an arch, but without the l sufficient, but I also have arranged to use two'siich coolers, oi' I may use three or e'ven moie, located in different portions of the panying this specification. I may alsofmake the surface of the cooler flush with tlie" interior 'of the lining, or I may make it project Islightlyaabove the saine, being careful in this latter case to forni the projections iii such a way that their surfaces are not. on radial lines, but forni a -wider angle so that in case any material should aecuinulateon the linings between tivo coolers it would not be wedged between the surfacesof the coolers,

as there will be a vclearance-to enable the ini'iterial to drop down as'the furnace is revolved. i

Having thus given a general description of my invention, I' will now, inA order to 'make the mattei' more clear, refer to'the sheet of drawings accompanying this'specif Y' 4105 iicatio-n, and -in which like characters indicate l like parts.

furnace as indicatedI in vdra-wimtis accom-A Figure l is a vertical sectional elevation of'iny improved rotary furnace 'which' is broken into-- three parts 'for convenience of illustration, as the furnace is preferabl7 verylong. Fig. 2 is across section throng the lower endiof my furnaceshowing thel pipes,'instcad of one.

. out a cooling olof l;

vcases for preventing shell, the lining, one form of my cooler, and the circulating pipes within the cooler; also showing one of the tires and wheels upon which it runs. Fig. 3 is an arrangement of the lower end of the furnace in which, however, l provide three coolers instead of one. Figf/l a cross section of the lower end of my furnace showing my cooling pipes, withsurrounding the same. Fig. 5 is an arrangement similar to Fig. 4, except that I provide three' sets of cooling Fig. G isa cross section of the lower part of the furnace showing my cooler of modified form, the block or body ofwhich projects beyond the lining This form is useful in some the accumulation 'of materials in .the furnace, Fig. 7 shows a style of cooler similarto that shown in Fig. 6, except that l use three coolers in this case.

of the furnace.

Fig. 8 is a cross sectional plan of the lower' end of my cooler showing the construction of the same and the manner of attaching the discharge and supply pipes or conduits to the same. Fig. 9 is vertical cross section through the exterior pipe 'or conduit connection-s showing Vthe manner in which they are made, so that the furnace may revolve while the supply and discharge pipes are maintained inoperative connection with the.r

cooler.

Referring now tothe various characters of reference' on the drawings'z-l indicates i 'as indicated at 5.

` against the lsides of upper tire 6 to maintainthe hodyV of the furnace which is of general cylindrical form with a tapered upper por` tion indicated at' 3, the lower portion of the cylindrical furnace being ,indicated at2, and is'curved or beveled'so as to readily-dischargevthe materials therefrom.

The metallic cylindrical shell of the furnace is indicated at 4, the refractory lining of which. may he of bricks or other material The annular tires on which the furnaccis mounted and revolves are indicated at 6 and 7 is an annular gear wheel secured to the shell Yof the furnace, meshing` with the driving pinion 8 which latter is connected to any suitable. source Yof power for revolving the furnace as desired.

The anti-,friction wheels on which the tires G, revolvepare indicated at 9, while 10 represents anti-friction side hearings resting the furnace in position longitudinally.

rljhe'removable fronthood is indicatedat 11 this'heing lined with refractory material as shown,. an'dadapted to cover the lower end of jthe furnace when in operation.' `The hood A11 is mounted on truck wheels 12 which Vare carried hy the track 13 this arrangement being for the purpose of removing the-hood longitudinally from the furnace soas to have access to the interior of same when de. sired. Openings 1n the front Yofv the hood for the passage of oillor other fluid, and air i. vw.

culating pipes 17 for combustion are indicated at 14;, while 1:5 is a central opening in line with the axis of the cylinder through which my cooling pipes 17 and Q2 are passed. i

1G represents my cooler tudinally of the furnace and forming part of the refractory lining thereof. The form' of cooler indicated by 16 is made of cast iron or other suit ble material in which cirextending longi- 7@ culating pipes or conduits 17 and 18 areas tions these circulating pipes or conduits will a5 serve the purpose. y

In Fight) three pairs of similar circulating pipes or conduits are shown as these' may be" useful under certain conditions of serv ice.-

In Fig. 6 a modified form of cooler is in 9o dicated at 19, the cross-section of this being in the shape `of a trapezoid vwith a superimposed trapezoidal projection `rising above theA surface of the. refractory lining of the distance between the projecting corners of the adjommg coolers as shown m Flg. 7, 1s greater than that between the bottoms of the might tend to accumulate between two acljoining coolers would not be wedged therein, but will readily drop out as the furnace re# volves.

furnace. -Y The angles ofthe sides of this a5 projection are comparatively flat so that the adjoining coolers, so that any material which v ln Fig. 6 lishow one cooler '19 with cir- 105 while' inFig. 'l l show three such coolers.

The stack or chimney connection is indrand'18 inclosed thereinjf'dAix cated at :20, and 21 is a chute throughwhich i flue-dust, tine-ores or othermaterials are fed` to the furnace. I provide a cooling pipe or 'conduit 2.2 which enters the furnace on the axial "line thereof and then extends ou a radiall line to the furnace vshell and is there connected with the cooler 1G as shown in detail in Fig. 8.

The exterior supply pipe is indicated at 32 and this is stationary, while the dis charge-pipe. 23 is also stationary, this ar-l rangement being made to provide a proper mechanical way for the supply and discharge of a cooling medium, such as air or water, to and from inycoolers or circulating pipes. -ln order that the furnace may revolve and the` cooler, at the same time, be supplied with cooling mediunnl provide reuoluble hut fluid tight connections from, the stationary supply pipe and the stationary,'discharge-pipe to the corresponding circulating pipes of my cooling arrangement. 12 D On the end of the pipe or conduit 22 I provide a stuffing-box 2i in which isseated a metalliV ring beveled as shown and above which is a compressible Qr soft metal packing Q6 secured and maintained in place by the gland 27. A pipe-section Q8 is fitted within the stuffing-box 24, said pipe-section being provided with an annular projection- QSYat the end thereof. Thisvannular projection abuts against the removable metallic ing 25 which thereby enables-the pipe to resist the longitudinal pressure of the cooling medium and thereby maintains the joint in proper position. A gland is indicated at 550 unich surrounds the body port-ion of the interior supply lpipe 17 operating Within a stutling-box provided with bolts as indicated. he outer end of the interior supply pipe 17 is provided with a stuffing box 31 and has secured therein a metallic ring 341, one side of which is flat and the other beveled as indicated. The stuiiing-box, 31 is provided with packing 85 and a gland 3G a'djusted thereto by bolts as indicated.

32 indicates the supply pipe which is provided with an annular enlargement 33 which -abuts the metallic ring 3st and thereby pre-- vents the pressure of the cooling medium from forcing the pipe 82 out of place. By means of the arrangement `inst described, water, air, or other cooling medium is supplied to the cooler throughthe stationary pipe and discharged therefrom.through the stationary pipe 23, While the supply pipe i7 and the discharge pipe Z2 are permitted to revolve with the furnace, thereby maintaining the connections for the passage and circulation of the coolinginedium.

Referring now to Fig. S, 16 'represents the lower end of one forni of my cooling construction, 17 the supply pipe secured therein, the two portions of which, however, arc united by a right and left threaded coupling as shown at 39, whereby the pipes or conduits 17 and 22 can be conveniently connected to and disconnected from the cooler 15. 18 represents the discharge pipe which is secured within the casting 1G and adapted to discharge the' cooling medium into an irregular space 38 formed in the end of the cooler 1G, this space also connects with the annular space around the supply pipe 17 between the inner wall of the out-let pige 22 and the outer wall of the supply pipe 17 mounted axially therein. 37 is a iiange secured by bolts as shown to the end of the casting 16 and into which tiange the pipe 22 is secured as indicated.

By means ofthe construction shown in iig. 8, my supply and discharge pipes 17 and 22 respectively,can be connected to the circulating pipes or`"conduits 17 and 18 of my cooler. The arrangement of the pipe 17 vwithin the pipe 22 on the axial line of the furnace cylinder provides a convenient means of supplying circulating cooling Huid through my cooler. l

Although I have shown and described my vimprovemcnts in considerable detail, I do not wish to be limited to the exact and specific details shown and described, but may use such substitutions, modifications or equivalents thereof, as areembraced Within the scope of my invention or as pointed out in the claims.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

1. In a rotary sintering furnace, provided with a refractory non-metallic lining, a narrow metallic cooler arranged longitudinally `therein having separate supply and discharge conduits and provided with circulating means for supplying a cooling medium thereto and discharging the same therefrom, said cooler extending only through the regions of sintering tenvlperature in said furnace, whereby the accumulation of sintered material is prevented, substantially as described.

2. In a rotary furnace a cooling apparatus arranged vlongitudinally therein, separate supply and discharge conduits within said cooler and means arranged on the axial line of the furnace for maintaining connection between said conduits and exterior supply and discharge pipes communicating therewith.

3. In-a rotary sintering furnace, provided with a refractory lining, a narrow metallic cooler mounted longitudinally therein, comprising a portion forming part of the furnace lining in the region of the sintering temperature therein and provided with circulating conduits therethrough, and means arrangedon the axial line of the furnace for maintaining said conduits in connection with exterior stationary supply andpdischarge conduits.

4. In a cylindrical rotary furnace provided With a nonanetallic refractory lining, a narrow metallic cooler arranged longitudin-ally therein, separate circulating pasin said cooler, supply and discharge conduits arranged cxteriorly of the furnace on the axial line thereof and provided with rcvoluble joints, whereby connection is maintained between said circulating passages and exterior supply and discharge conduits. A l

5. In a rotary furnace of the character described, a narrow metallic cooler mounted longitudinally therein, comprising a body forming a portion of the refractory lining of said furnace and provided with separate circulating conduits therein, said conduits being connected. on the axis of the furnace with suitable sources for the supply and dis charge of a cooling medium therethrough.

6. In a rotary furnace a cooler arranged LIN emgitudinaliy therein7 "the body porieri of jirejeetien above seid iinirw, the surfaces of said. projection being disposed at aV less angie iii n r1 igiie radial linee of the furnace, whereby :i eiearariee is provided to permit aeemriii-I laire@ meier-ini, i0 drop from Said lining.

,in :L reziry sinierng furnace a refrzu iery iriirig of the character described, a raars-ow metallic eooier mounted longituiiiiaiijf iherein in the region of the sintering teiriperunre @if the nmerias in en/tec'lu and pronged with means for circulating a cool-- dimm 'theredlireugh whereby the zielen ef smerefi material 'Within die imfimee .is prevented.

ik in aTi winery einie @iig fern-rice, provided with e rel-5f Eni-119;, a purzrtjg of nar row' 1ra" We @Geier therein i f perature "fie rimerias treated, supply and iisszhsrrfge "miriduite in said molers, means arrivage m 'Fue :del iiie of said ifm' :e 'for eu 'J lig a eenling medium te rfi eerdere anti diseimrgiiig the same there from the aeeumuatien of sntered s 'prei' j A e regimi 0i? die Sinierng inemf,

1i ecL men); whereof 5. hereto afin; my 

